TM 55-4920-429-13SECTION II PREVENTIVE MAINTENANCE CHECKS AND SERVICES3-8. Preventive Maintenance. preventive maintenance is the systematic care, servicing, and inspec-tion of equipment to prevent the occurrence of trouble, to reduce out-of-service time, and to ensure thatthe equipment is serviceable.a. Systematic Care. The procedures in para 3-9 cover routine systematic care and cleaning essentialto proper unkeep and operation of the test set.b. Preventive Maintenance Checks and Services. The preventive maintenance checks and serviceschart (para 3-9) outlines functions to be performed at specific intervals. These checks and services areperformed to maintain the test set in serviceable condition; that is, in good general (physical) conditionand in good operating condition. Before you operate, perform your before (B) checks and services.3-9. AVUM Preventive Maintenance Checks and Services Chart.NOTEWithin designated interval, these checks are to be performed in theorder listed.B-BeforeProceduresEquipment IsItemIntervalItem to beCheck for and have repairedNot Ready/No.BInspectedor adjusted as necessaryAvailable If:1lCase andClean exterior, using cloth.coverFor stubborn dirt, usecloth damp with cleaningsolvent.2l3l4l5l6lNameplateCondition, legibility.LatchesCondition, secure mounting.HandlesCondition, secure mounting,positive closure.Air valveCleanliness, operation.CablesInsulation for condition.Repair damaged insulationusing tape. Connectorshells for condition. Re-place cable if shell isdamaged. Contacts forcleanliness. Clean asrequired.3-6